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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts for the Cowlitz River at Castle Rock are issued routinely year-round.
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Upstream Gauge - below Mayfield Dam Upstream Gauge
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 57
Moderate Flood Stage: 54
Flood Stage: 48
Action Stage: 46
Low Stage (in feet): 0

Historic Crests
(1) 55.76 ft on 02/08/1996
(2) 55.16 ft on 11/30/1995
(3) 54.70 ft on 01/08/2009
(4) 52.95 ft on 05/18/1980
(5) 52.45 ft on 12/09/2015
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(P): Preliminary values subject to further review.

Recent Crests
(1) 49.01 ft on 01/07/2022 (P)
(2) 52.45 ft on 12/09/2015
(3) 54.70 ft on 01/08/2009
(4) 49.78 ft on 11/07/2006
(5) 47.58 ft on 02/01/2003
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
57 expect widespread and major flooding of homes and property just upstream and downstream of Castle Rock. Impacts include major flooding of the fairgrounds area west of Castle Rock, numerous road closures, and possible overtopping or weakening of portions of the levee protecting Castle Rock, especially sections downstream of the highway bridge.
54 expect widespread flooding of residential and business areas, especially west of the river in the Four Corners area and along Hwy 411. Also expect widespread flooding of agricultural land. Levees have historically been threatened of overtopping at this and higher levels.
51 flooding of buildings and residential areas begins, especially west of the river along Hwy 411 and around Four Corners. Also expect widespread flooding of low-lying agricultural land.
48 expect flooding of several roads and low-lying agricultural lands in areas not protected by levees.
(1) USGS gage house and A Street Bridge
(2) USGS gage house and view upstream
(3) View downstream from gage house

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
10-day Forecast/Trend, Northwest River Forecast Center
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
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Portland, OR 97230-1089
(503) 261-9246
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Page last modified: 2-Nov-2020 7:27 PM
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